Spray gun



FIG. 1 is a front elevation of a spray gun showing my new design;

FIG. 2 is a right end elevation thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevation thereof; and

FIG. 6 is a left end elevation thereof.

The ornamental design of a spray gun, as shown and described.